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Webpage loading speed or site speed is now a Ranking factor in Google's algorithm, and is already in place for U.S. searchers. But Google also warns the users not to forget about the relevance in the name of faster web pages and this factor affects only very few pages but only less then 1% queries are affected. So, you can see a very minor change, since the average search query is returning 10 or so search results on each page. So please don’t worry that the effect of this change will be huge.

So, if you want to compare the speed of two websites you can use this site. This site not only compares the site but you can analyze the result to see why your site speed is slow , you can catch the main culprit responsible for the slow speed i.e it may be javascript, cookie sizes, heavy images, uncompressed css and many other problems. . .

speeding up your website is a great thing to do in general. Visitors to your site will be happier (and might convert more or use your site more), and a faster web will be better for all.